Sit a partner down and ask them to list every piece of software the firm pays for. Almost nobody gets the list right on the first attempt. The tools that get remembered are the big-ticket ones - the ledger, the tax engine, Microsoft 365. The tools that get forgotten are the £15-a-month subscriptions a manager set up for a one-off engagement, never cancelled, that still bill three years later. This is stack sprawl, and the cost of it goes well beyond the direct subscription line.
How firms accumulate fourteen tools without trying
A 25-person firm typically pays for: a ledger (often two - one for the firm, one for clients via partner programme), a tax engine, a practice management tool, a payroll product, an AML tool, an e-signature tool, a receipt-capture tool, a document store, Microsoft 365 or Google Workspace, a video conferencing product (if separate), an internal chat tool, a forecasting tool, a CRM (often half-used), and a website CMS. That is fourteen before you count the password manager, the calendar scheduler, the survey tool and the three "free trial" subscriptions nobody cancelled. The number sneaks up on you.
The direct cost - the easy bit
Sticker price per tool is the obvious cost. A 25-person firm with a typical stack will spend somewhere between £15,000 and £40,000 per year on software alone, depending on tier and add-ons. That is not catastrophic on its own. It is, however, almost always inflated by 10 to 25% by tools that are paid for and not actually used, or tools that overlap with another tool the firm also pays for. An annual subscription audit recovers this routinely.
The integration tax - the much bigger bit
Every tool you add to the stack creates n integration points with the tools already in it. Three tools mean three relationships to manage. Six tools mean fifteen. Fourteen tools mean ninety-one. Most of those relationships are never explicitly configured; they default to "no integration, re-key by hand". The cost shows up as: time spent copying data between tools; reconciliation errors when copies drift; the senior's time spent triangulating between four dashboards to answer one question; and the inability to produce a unified firm-level view of anything.
The cognitive load on staff
Every additional tool is a login, a UI, a set of keyboard shortcuts, a notifications system, a training requirement and an onboarding step for new hires. Staff time spent context-switching between tools is invisible in any accounting system but real in the felt experience of the working day. The firms with the most engaged, productive staff tend to have leaner, more consolidated stacks - not always because the stack was deliberate, but because the cognitive overhead is genuinely lower.
The security surface area
Every additional tool is an additional credential, an additional vendor with access to firm or client data, an additional set of permissions to review, and an additional vendor whose own security posture you implicitly inherit. The leavers process now has fourteen steps instead of seven. The data processor register under GDPR now has fourteen entries to keep current. The supplier due diligence the firm should do - but mostly does not - now has fourteen suppliers to assess. Sprawl is a security problem before it is a cost problem.
The audit and supervision angle
AML supervisors increasingly ask firms to demonstrate how their systems work together, where client data sits, and how access is controlled. A firm with a consolidated, deliberate stack can answer in one diagram. A firm with sprawl has to scramble and often discovers gaps mid-visit. The same is true for ICO investigations after an incident. The cost of sprawl in this dimension is potential - a fine you have not yet been issued - but the regulators are not getting more lenient.
How consolidation actually works
Consolidation does not mean buying a single mega-tool that "does everything badly". It means deliberately choosing best-in-class in each of the categories the firm actually needs, and ruthlessly cutting the rest. The pattern that works: ledger, tax engine, practice management with native AML and client portal and e-signatures, document store inherited from the productivity suite, one identity platform, one forecasting tool. That is six to eight subscriptions covering the surface that fourteen used to. Accupe collapses several of those categories - practice management, AML/KYC, client portal, e-signatures, AI document chat, Companies House integration - into a single platform, which is often where the largest single consolidation win sits.
The audit, executed
A useful exercise to do this month: pull every standing order, direct debit and corporate card subscription, and produce a single list of every tool the firm pays for. Categorise each as essential, useful, vestigial or unknown. Cancel everything in the bottom two categories. For the top two, ask whether two tools could be one. The first time a firm does this, the recovered spend typically funds a meaningful upgrade in something the firm actually needs.
Closing
Stack sprawl is not caused by bad decisions - it is caused by good decisions made one at a time without anyone owning the whole. The fix is also organisational: someone in the firm owns the stack, audits it annually, has authority to consolidate, and is measured on the coherence of the whole rather than the brilliance of any individual choice. The firms that do this are quieter, leaner, easier to work in, and easier to defend in a supervision visit. The firms that do not are slowly being weighed down by their own tooling.